[Gaurav0]

Summary

This fork will keep Bootstrap 3 support and subclassing of the component classes, so neither should warn that it's going away.

• Subclassing is a port of upstream Drop component subclassing deprecation ember-bootstrap/ember-bootstrap#2049 (released in upstream 6.2.0).
  • addon/utils/deprecate-subclassing.js, every @deprecateSubclassing and the __ember-bootstrap_subclass escape-hatch fields are removed.
  • Unlike upstream, BsProgress and NavbarContent stay empty classes rather than templateOnly(), so they can still be subclassed.
  • The API docs now say subclassing is supported.
  • The subclassing test checks that a subclass of each of the 15 public components renders with no deprecations.
• Bootstrap 3: index.js no longer warns at build time that support "will be removed in ember-bootstrap v5". The Glyphicon hint for Bootstrap 4/5 stays.
• README: the intro says Bootstrap 3, 4 or 5. A new "About this fork" section covers git-tag installs, independent version numbers, and that Bootstrap 3 and subclassing stay supported.

45 files, +39/−151 lines. No dependency or yarn.lock changes.

Stack

Part of the SCF-2416 work (ember-bootstrap 5.0.0), split from scf-2416-rework for easier review. This is part 7 of 9. Stacked on Part 6: its base is gaurav/chore/SCF-2416-part-6-upgrade-addon-deps, so the diff only shows this part. Merge in order.

Part	PR	Title
1	#16	Drop Ember 3.28 and 4.4, bump to 5.0.0
2	#17	Upgrade test and lint tooling (ESLint 8, Prettier 3, ember-try 3, stylelint)
3	#18	Upgrade build dependencies and drop polyfills
4	#19	Require Node 20 and switch @embroider/util to a fork
5	#20	Replace ember-on-helper and ember-ref-bucket
6	#21	Upgrade addon dependencies off ember-cli-babel 7
7	this PR	Keep Bootstrap 3 and subclassing, drop their deprecations
8	#23	ember-cli-update to the 5.4 addon blueprint
9	#24	Force and refresh remaining vulnerable dependencies

Review notes

Most of the 45 files only drop the import and decorator. Look at tests/integration/components/subclassing-test.js, index.js and the README section.

Testing

Run on this branch with Node 20.19.6: yarn install --frozen-lockfile passes, yarn lint reports 0 errors (the same 150 warnings as scf_master), and ember test (Ember 4.8, the default) has 535 passed, 9 skipped and 0 failed. −15: the subclassing test now has one test per public component instead of two (assert the deprecation, then silence it). CI covers the ember-try matrix.

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